Digester-lining.



BATENTED Nov. 24, 1903.

NDOERFBB.. l R LI'NINGr.

ILBD DBO. 6, 1902.

G. LANZ DIGESTE Y i Y i WVIEEEEE: i

B* v K l v n .v l

INE "CHRIS PETERS CD FMD-LITHO WASHINGTON D C usual type of digester shell or casino.

or may not be lined upon' its inner surfacel UNITED STATES vPatented ovember 24, i903.

PATENT OFFICE.

DIGESTERLINING.`

SPECIFICATION forming part of Letters Patent N o. 744,769, dated November 24, 1903;

To a/ZZ whom t ma/y concern:

Be it known that I, GEORGE LANzENDonR- FER, a citizen of the United States, residing at Boston, in the county of Sniolk and State of Massachusetts, have invented a new and usefullmprovement'in Digesters and Lining- Bricks Therefor, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

The invention consists in a digester which has a metal shell of the usual type'and which is lined upon its interior with acid-resisting bricks ot' a curved shape having a plain outer face-and a deeply-corrugated inner face, the corrugations forming receptacles or pockets for a cement used in uniting the bricks to the shell and to each other. vThis provides a structure in which the bricks may be set directly against the shell or Vbricks carried thereby and in which the joints between the bricks and the shell and the individual courses of brick are formed by a series ofrin gs or sections of cement arranged between thebricks and so as to, in eiecmproduce' as many different joints and variety of joints as there are rings, the purpose ofthe invention being to provide a structure which shall eifel .the`greatest resistance to the strains to which is a View in perspective of one of the bricks.`

Referring to the drawings, A represents the It may with lead or other.acid-resistingsubstance. To the inner surfaci 0f of the shell or to the said lining, if one be d, there is then applied the bricks B in as ma courses as may be desired. The bricks are alike, and each is curved to confermato the curvature of the shell and has a smooth curved surface a and a corrugated back-b, the corrugations extend- Application filed December 6, 1902. Serial No. 134.077. (No model.)v

ing crosswise the back and being relatively' wide and deep and separated by relatively narrow intervening parts b' of the brick-back, which are substantially of the same size and the outer edges of which are arranged upon the same curve. These bricks preferably have flat sides and ends, the ends being somewhat inclined, as represented. The bricks thus shaped will Vform, assembled together, a wall 'of the curvature ofthe dif gester-wall.

As many courses of brick may be used as desired, the first course being against the wall of the digestershell and thenext course against the firstcourse of brick, and so on.

Each course is united to its support,whether l digester-casing or brick, by means of cement applied to thecorrugations to fill the same and to bear against the support, the beds of cement thus held in the corrugations acting as so many bands to unite the courses of brick to their supports fas well as to provide a series of independent joint-sealing packings between the courses. The joints between the sides and edges of the bricks are sealed in Vany desired way. -Because of the corrugations in the bricks which receive thepcement a larger surface for the adhesion of the cement to the bricks is provided than where the surface is straight, while, on the otherl A hand, sections of the back of each brick are brought intocontact with its support, thus breaking the continuity of the cement and causing a structure which consists of alternate bodies of cement and brick. The employment of the cement in this manner not only effects a structure of lthe character indicated, but it also furnishes 'a large number of independent cement joints, which because of their independenceprovides an improved construction in that a crack or defect of any kind in one joint is confined to that joint and does not extend to other joints, so that an imperfection in one part of the cement is confined to that and a very narrow one'and does not necessarily extend to another, and

the joints thus act to correct each others posthey can be assembled or built in the arch of ICO the digester without the use of temporary or false supports.

Having thus fully described myinvention, I claim and desire to secure by Letters Patent of the United States- 1. The improvementin digesters herein described, the same consisting in the employment as a lining for the digester, of a number of courses of bricks having corrugated backs and independent joint-sealing packings contained in said corrugations uniting said bricks to each other and to the dgester-shell.

- 2. A digester-lining consisting of a series of bricks each having a corrugated back of alternately, extended and recessed portions, cement filling said recessed portions of the 

